856539523 has 8 divisors (see below), whose sum is σ = 984372480. Its totient is φ = 730074120.

The previous prime is 856539511. The next prime is 856539539. The reversal of 856539523 is 325935658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856539523 - 2²⁵ = 822985091 is a prime.

It is a super-2 number, since 2×856539523² = 1467319908922135058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (856539553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340543 + ... + 343048.

It is an arithmetic number, because the mean of its divisors is an integer number (123046560).

Almost surely, 2^856539523 is an apocalyptic number.

856539523 is a deficient number, since it is larger than the sum of its proper divisors (127832957).

856539523 is a wasteful number, since it uses less digits than its factorization.

856539523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683777.

The product of its digits is 972000, while the sum is 46.

The square root of 856539523 is about 29266.6964825209. The cubic root of 856539523 is about 949.6913209505.

The spelling of 856539523 in words is "eight hundred fifty-six million, five hundred thirty-nine thousand, five hundred twenty-three".